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EP3160724B1 - Method and apparatus for assembling a tire blank - Google Patents

Method and apparatus for assembling a tire blank Download PDF

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Publication number
EP3160724B1
EP3160724B1 EP15729769.8A EP15729769A EP3160724B1 EP 3160724 B1 EP3160724 B1 EP 3160724B1 EP 15729769 A EP15729769 A EP 15729769A EP 3160724 B1 EP3160724 B1 EP 3160724B1
Authority
EP
European Patent Office
Prior art keywords
strip
blank
drum
undulating
waves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15729769.8A
Other languages
German (de)
French (fr)
Other versions
EP3160724A1 (en
Inventor
Henri Hinc
Michel Druet
Michel Deboeuf
Nicolas Jaunet
Jean-Marie Dettorre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie Generale des Etablissements Michelin SCA
Original Assignee
Compagnie Generale des Etablissements Michelin SCA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication of EP3160724A1 publication Critical patent/EP3160724A1/en
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Publication of EP3160724B1 publication Critical patent/EP3160724B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/22—Breaker plies being applied in the unexpanded state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • B29D30/44—Stretching or treating the layers before application on the drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • B29D2030/381—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre the inserts incorporating reinforcing parallel cords; manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/10—Cords, strands or rovings, e.g. oriented cords, strands or rovings

Definitions

  • the invention relates to the field of the manufacture of tires for passenger vehicles or utility vehicles and is more particularly interested in assembling methods for successively installing all the components of such a tire without significant variation in the laying diameter.
  • the conformation is the transformation undergone by the tire blank as it passes from its substantially tubular shape to the generally toroidal shape of a finished tire.
  • the central portion of the blank which corresponds to the top of the tire increases in diameter by the action of an internal pressure while the beads are maintained at the initial diameter.
  • the difference in circumference between the seat diameter and the shaped diameter is generally between 30% and 70% and for example commonly of the order of 50% for a tire for a passenger vehicle.
  • the invention therefore aims to overcome at least one of the disadvantages described above.
  • the invention proposes for this a method and an installation for the preparation and laying within the tire blank of a strip comprising longitudinal reinforcements, said strip being laid in undulated form so that the length of the longitudinal reinforcements is very significantly greater than the laying length.
  • the term "reinforcing strip” or “strip” means a narrow rubber band including longitudinal reinforcements and intended to be laid by helical winding within the blank of a tire.
  • the reinforcements may for example be cables or monofilaments, made of steel, mineral material (fiberglass or carbon), synthetic fiber or textile material in a manner known per se in the field of pneumatics.
  • a strip comprises a plurality of reinforcements, for example between 3 and 10 reinforcements. Such a strip has a maximum width of the order of 15 to 20 mm depending on the total width of the hooping frame. More preferably, for the hoop reinforcement of a tire for a passenger vehicle, the strip has a maximum width of 11 mm.
  • the winding comprises a plurality of turns, for example between 10 and 30 turns to form a complete frettage reinforcement.
  • the continuous conveyor is a chain guided by an interference pinion in the interference portion of the closed circuit.
  • the fingers are carried by the axes of the links of the chain.
  • the device further comprises a static strip-drift positioned in the interference portion to be able to derive the strip from the fingers, preferably at least a quarter of a turn after the start of the interference portion.
  • the device further comprises means for rolling the corrugated strip.
  • the device further comprises a motorized capstan adapted to control its supply flat strip.
  • the helically corrugated strip is wound on the tire blank in order to form a reinforcement frame of the crown of the tire in a plurality of turns, the corrugated strip having a given over-length allowing the conformation of the blank.
  • the method further comprises a rolling step of continuously folding the waves of the corrugated strip during the winding of the strip on the blank, the wave folding movement towards the surface of the roughing taking place in a plane substantially perpendicular to the drum axis.
  • the wave height is varied during winding.
  • the method of the invention is a substantially continuous process which first consists of transforming a flat reinforcing strip 20 into a corrugated strip 21 and then placing it in undulating form on a tire blank 50. These two steps take place successively. and preferably in close proximity to one another. Gradually, a winding of several turns of this corrugated strip is made on the blank.
  • the waves of the corrugated strip 21 and the approach movement towards the surface of the blank extend in a plane perpendicular to the axis of the tire blank, that is to say a plane perpendicular to the axis 32 of the drum 3 which supports and controls the rotation of the blank 50. It is understood that the winding is made in a helix in a manner known per se to making a hooping reinforcement over a given width, this width being defined most often with respect to the expected width of the tread of the tire.
  • the method further comprises and as shown here a rolling step of transforming the corrugated strip 21 into a rolled corrugated strip 22, that is to say a strip whose waves have been folded on the blank after having been asked.
  • a rolling step of transforming the corrugated strip 21 into a rolled corrugated strip 22, that is to say a strip whose waves have been folded on the blank after having been asked.
  • the method of the invention therefore does not involve storage or management of an intermediate semi-finished product.
  • the corrugated strip is wound directly into the blank as soon as the step which gives it its undulating shape has been performed.
  • the installation 2 makes it possible to implement this method. It comprises the assembly drum 3 and a device for preparing and laying the strip.
  • This device 1 allows, in a first step, the in situ transformation of a flat reinforcement strip 20 into a corrugated strip 21 and, in a second step, the laying of the strip in undulated form on a tire blank 50.
  • the device allows in a third time to transform the corrugated strip 21 into a rolled corrugated strip 22, that is to say a strip whose waves have been folded on the surface 31 of the blank 50.
  • the device 1 comprises a closed circuit along which fingers move in the direction indicated in the figure by the arrows.
  • the fingers are guided along the circuit by a continuous indexed conveyor 4 such as a chain or a toothed belt.
  • the continuous conveyor is animated here by a transporter gearmotor 42.
  • a rotating plate 6 carries rollers 7 distributed at its periphery on a circle 61 concentric to the axis of rotation AP of the rotating plate.
  • the rotation of the plate is controlled by a platinum gear motor 62.
  • Synchronization means make it possible to control the speed of the two geared motors so that the displacement of the fingers 5 along the circuit is coordinated with the displacement of the rollers 7 of the plate, in particular in a PI interference portion in which the fingers and the rollers can thus move in a common plane perpendicular to the platinum axis AP and the axis of the drum 32.
  • the fingers 5 bear on the upper face of the strip while the rollers 7 are supported on the underside of the strip.
  • the rollers of the plate are interposed between the fingers and gradually force the strip to take an undulating form 21.
  • the device 1 is placed facing the tire blank 50 carried by the rotary assembly drum 3 so that the rollers of the turntable come one after the other approaching the surface 501 of the 'draft.
  • the operation of the device described above is synchronized with the rotation of the drum.
  • the vertices 211 of the waves of the corrugated strip 21 can then come into contact and be pressed one by one against the surface of the blank 501.
  • the rubber strip can thus adhere punctually to the moving surface of the blank and then be driven by it.
  • the device 1 preferably comprises a fixed strip-drift 63 whose function is to axially escape the strip 21 of the fingers once the corrugated strip is bonded to the blank. The strip is then driven by the blank and rolls while escaping the control of fingers and rollers of the device.
  • the strip drift acts in the interference portion PI, preferably at least a quarter of a turn after the start thereof.
  • rolling means 30 make it possible to fold down the waves of the corrugated strip 21 by pressing them against the surface of the blank.
  • the rolled corrugated strip 22 is thus still better fixed with respect to its position and to the longitudinal orientation of its reinforcements, which makes it possible to ensure the best distribution of the over-length of the reinforcements on the circumference of the blank.
  • FIG 2 in perspective allows to better visualize the constituent elements of this preferred embodiment of the installation.
  • a guide pulley 9 placed in the plane and inside the closed circuit 4 guides the flat strip towards the interference portion PI fingers and rollers.
  • the guide pulley 9 receives the strip of a feed pulley 10 also placed in the plane of the finger circuit but oriented to receive the strip from the outside, for example from the back of the figure 1 in this embodiment.
  • the strip 20 is twisted about a quarter turn between the two pulleys.
  • the drive principle of the fingers 5 is also clearly seen by the continuous conveyor 4, here in the form of a chain 41.
  • the chain 41 circulates around two pinions 411 and 412.
  • the driving pinion 411 is driven by the drive motor. carrier 42.
  • the interference pinion 412 is rotated by the chain and has the sole function of guiding the chain and thus guiding the fingers 5 opposite the rollers 7 of the plate 6.
  • the movement of the chain must be in perfect synchronization with the rotation of the plate 6 carrying the rollers 7.
  • This synchronization is guaranteed by the synchronization means, for example by a common control of the two electric motors 42 and 62.
  • the pinion of interference 412 can be rotated by the same motor as the turntable. Since the pinion 412 is not necessarily coaxial with the platinum axis, the drive may preferably be via an Oldham seal or a shaft equipped with homokinetic joints.
  • a base 16 movable relative to a frame 17 makes it possible to control the position of all the elements of the device relative to the drum and therefore to the blank and also makes it possible to control the pressure with which the corrugated strip 21 is applied by the rollers on the surface of the blank.
  • the rolling means here in the form of a pressure roller 30, are also carried by the mobile base 16, for example by means of a pneumatic cylinder 31 (see also figure 1 ) impressing them with an elastic support force.
  • the position of the mobile base 16 is here controlled by an electric jack 19.
  • a slider 15 itself movable relative to the base 16 supports the two gears 411 and 412 of the continuous conveyor. It is understood that by slightly moving this slider relative to the support of the turntable (and thus relative to the platinum axis AP), it is possible to vary the height of the waves imposed on the strip. In this way it is possible to precisely vary the over-length given to the corrugated strip.
  • the displacement of the slider 15 is here controlled by an electric ram jack 18. In order to give an order of magnitude, it can be said that an over-length of 50% is obtained when the waves have a height (amplitude) of about 11 mm.
  • the figure 3 shows on a larger scale the principle of this embodiment concerning the formation of waves by the cooperation of the fingers 5 and rollers 7 in the interference portion. It also shows the principle of the drift-strip 63 (in the form of a static cam) which has the function of deflecting the strip to escape from the finger 5 after it has been pressed against the blank (no represented here).
  • the strip-drift comprises an inclined plane along which the edge of the corrugated strip 21 slides. It is understood that at this stage of the method, the strip is already associated with the blank.
  • the figure 4 shows on a larger scale still a detail of this embodiment of the device and particularly of an embodiment of the continuous conveyor and fingers.
  • the axes 413 of the links of the chain 41 support the fingers 5 rotatably mounted on said axes by means of ball bearings 414.
  • the fingers 5 are therefore free to rotate relative to their supports to allow the strip to circulate. to form its waves by imposing the least possible effort on the device (and the tape itself).
  • the figure 5 shows on a large scale a detail of this embodiment of the invention and particularly of the rollers 7 carried by the rotating plate 6.
  • the rollers are rotatably mounted on the plate by means of bearings (for example plain bearings). Like the fingers, the rollers are free to rotate relative to their supports in order to allow the strip to circulate to form its waves by imposing the least possible effort on the device (and the strip itself).
  • the installation therefore makes it possible to implement the method according to the invention of preparing a corrugated strip having a controlled over-length, the corrugated strip then being wound in its corrugated form directly on the blank of a tire during his confection.
  • the direct laying on the blank makes it possible to guarantee the accuracy of the laying, in particular as regards the value of the over-length of the reinforcements and the regular distribution of this over-length on the circumference of the blank.
  • a suitable number of turns of the corrugated strip are thus wound in a helix so as to constitute the hooping reinforcement of the tire.
  • This winding can be done to the diameter of the seat as described above in the preamble of the application since the over-length of the reinforcements of the corrugated strip then allows the blank to be shaped, that is to say, to take the practically final form of a tire, before said reinforcements at 0 ° are actually put in tension.
  • the over-length of the strip is also possible to vary the value of the over-length of the strip by controlling the position of the slider 15. It may for example be provided that the over-length is greater in the center than the shoulders of the tread so that a certain curve is given to the tire during the shaping of the complete blank.
  • FIG 6 schematically an example of tire blank 50 obtained according to the invention is shown schematically.
  • the shrink reinforcement disposed within a blank during the manufacture of a tire The drum on which the blank has been assembled until this stage is not shown.
  • 0 ° reinforcements are recognized in the form of a corrugated strip 21 as formed by the method of the invention.
  • the waves of the strip extend in a plane perpendicular to the axis of the blank (neglecting the helix angle of the winding as discussed above).
  • the waves of the strip are therefore in a plane parallel to the equatorial plane of the tire which will be obtained from this blank.
  • About fifteen turns were wrapped around the blank to form the complete hooping frame.
  • Top reinforcement plies may be placed under the hoop reinforcement.
  • a layer of sealing rubber 53 is preferably present inside the carcass 51.
  • the reinforcing strips at 0 ° are represented here in the undulating form 21 but not rolled (referenced 22 in the previous figures) in order to facilitate reading the drawing. It is understood that the rolled shape may be preferred to improve the accuracy of the positioning of the reinforcements in the following process as described above.
  • a tread and sidewall protectors can then be added to this blank in a manner known per se. All the components of the future tire can thus be placed at the same reduced diameter, that is to say on the same drum to the diameter of the seat and therefore without intermediate conformation.
  • the laying drum may also have a diameter slightly greater than the diameter of the seat if it includes grooves for receiving the beads of the blank. We then obtain rather a draft as represented in figure 7 .
  • the complete blank thus formed can then be placed in a vulcanization press, shaped and then molded and vulcanized in a manner known per se.
  • the feeding of the flat strip device is subject to a precise control of its flow.
  • This can be achieved through the use of a motorized capstan 100 as shown in FIGS. Figures 8 and 9 .
  • a motorized capstan 100 as shown in FIGS. Figures 8 and 9 .
  • a strap 103 stretched between refits 104 comes to press the strip on the capstan pulley to prevent any inadvertent sliding.
  • the speed of rotation of the capstan ie the speed of the flat strip feeding the device, can be precisely controlled according to the speed of rotation of the blank to control just as precisely the over-length of the reinforcements placed , including dynamically during helical winding of the corrugated strip as described above.
  • the offset between the platinum axis AP and the axis of the interference pinion can be adapted passively by means, for example, of a simple spring tending to move back the slider 15 or actively through a management based on a measurement of the effective tension of the strip.
  • This device 200 comprises two pinions 201 and 202 whose teeth mesh and cooperate to deform the flat strip 20 and turn it into a corrugated strip 21.
  • the strip is kept pressed to the bottom of the teeth by a depression in the channels 203. These channels are in depression as long as they are in communication with the fixed sector 204 itself connected to a source of vacuum.
  • the vertices 211 of the waves of the strip are pressed one by one by the teeth of the pinion 202 against the surface 501 of the blank 50 in a manner comparable to that described with the device of the preceding figures. Once the tops are trained by the rough, the depression can even be replaced by a slight pressure to help the strip to leave the bottom of the teeth.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Tyre Moulding (AREA)

Description

L'invention concerne le domaine de la fabrication des pneumatiques pour véhicules de tourisme ou utilitaires et s'intéresse plus particulièrement aux procédés d'assemblage permettant de poser successivement l'ensemble des constituants d'un tel pneumatique sans variation sensible du diamètre de pose.The invention relates to the field of the manufacture of tires for passenger vehicles or utility vehicles and is more particularly interested in assembling methods for successively installing all the components of such a tire without significant variation in the laying diameter.

Dans ce type de procédés, l'ensemble des opérations d'assemblage de l'ébauche de pneumatique sont réalisées sur un tambour dont le diamètre correspond de préférence sensiblement au diamètre intérieur du pneumatique (couramment appelé « diamètre au seat » en référence au diamètre normalisé de la jante sur laquelle le pneumatique sera monté lors de son utilisation). Ainsi, non seulement la carcasse, les bourrelets et les flancs, mais aussi les renforts de sommet et la bande de roulement peuvent être posés sur un tambour d'assemblage dont le diamètre correspond sensiblement au diamètre du seat. Un avantage de ce type de procédés est qu'il peut permettre de conserver l'ébauche du pneumatique sur le même tambour tout au long de son assemblage. L'ébauche complète peut ensuite être directement introduite dans un moule de vulcanisation où elle prend son diamètre extérieur final par l'action d'une pression interne. Un exemple de ce type de procédé est donné dans le document FR1508652 .In this type of process, all assembly operations of the tire blank are performed on a drum whose diameter preferably corresponds substantially to the inside diameter of the tire (commonly called "seat diameter" with reference to the normalized diameter the rim on which the tire will be mounted during use). Thus, not only the carcass, the beads and the sidewalls, but also the crown reinforcements and the tread can be placed on an assembly drum whose diameter substantially corresponds to the diameter of the seat. An advantage of this type of method is that it can keep the tire blank on the same drum throughout its assembly. The complete blank can then be directly introduced into a vulcanization mold where it takes its final external diameter by the action of an internal pressure. An example of this type of process is given in the document FR1508652 .

On appelle conformation la transformation que subit l'ébauche de pneumatique lorsqu'elle passe de sa forme sensiblement tubulaire à la forme généralement toroïdale d'un pneumatique fini. Lors de la conformation, la partie centrale de l'ébauche qui correspond au sommet du pneumatique voit son diamètre augmenter par l'action d'une pression interne alors que les bourrelets sont maintenus au diamètre initial. La différence de circonférence entre le diamètre au seat et le diamètre conformé est généralement comprise entre 30% et 70% et par exemple couramment de l'ordre de 50% pour un pneumatique pour véhicule de tourisme.The conformation is the transformation undergone by the tire blank as it passes from its substantially tubular shape to the generally toroidal shape of a finished tire. During the shaping, the central portion of the blank which corresponds to the top of the tire increases in diameter by the action of an internal pressure while the beads are maintained at the initial diameter. The difference in circumference between the seat diameter and the shaped diameter is generally between 30% and 70% and for example commonly of the order of 50% for a tire for a passenger vehicle.

Une limite de ces procédés provient du fait que l'armature de sommet des pneumatiques pour véhicules de tourisme ou utilitaires comportent de manière pratiquement systématique des renforts circonférentiels de frettage, souvent appelés « renforts à 0° ». La fonction de ces renforts à 0° est de brider fermement l'expansion circonférentielle du pneumatique lors de son utilisation, notamment à haute vitesse. On parle de renforts à 0° même lorsqu'ils sont posés par enroulement hélicoïdal et donc avec un très léger angle d'hélice. On néglige généralement cet angle d'hélice et l'on considère que l'effet des renforts de frettage est le même que s'ils étaient disposés dans un plan strictement parallèle au plan équatorial du pneumatique. On comprend que s'ils étaient posés sur l'ébauche avant sa conformation, ces renforts à 0° empêcheraient la conformation.A limitation of these processes stems from the fact that the crown reinforcement of tires for passenger or commercial vehicles comprises in a virtually systematic way hoop circumferential reinforcements, often called "0 ° reinforcements". The function of these reinforcements at 0 ° is to firmly clamp the circumferential expansion of the tire during use, especially at high speed. We speak of reinforcements at 0 ° even when they are laid by helical winding and therefore with a very slight helix angle. This helix angle is generally neglected and the effect of the reinforcements The hoop is the same as if they were arranged in a plane strictly parallel to the equatorial plane of the tire. It is understood that if they were placed on the blank before its conformation, these reinforcements at 0 ° prevent conformation.

Des solutions à cette impossibilité sont proposées par exemple dans les documents US4050973 ou US4094354 .Solutions to this impossibility are proposed for example in the documents US4050973 or US4094354 .

Le document US4050973 propose que les renforts à 0° soient préparés et posés sur l'ébauche de pneumatique sous une forme ondulée obtenue par tricotage de renforts à 0° avec des fils plus courts mais fragiles, ces fils étant rompus lors de la conformation. Un problème de ce procédé est manifestement la complexité et la lenteur de la préparation du tricot. Un autre problème est le fait d'avoir recours à des fils supplémentaires qui sont inutiles dans le produit final et qui peuvent en outre être nuisibles.The document US4050973 proposes that reinforcements at 0 ° are prepared and placed on the tire blank in a corrugated form obtained by knitting reinforcements at 0 ° with shorter but fragile son, these son being broken during the conformation. A problem with this process is obviously the complexity and slowness of knitting. Another problem is the use of additional threads which are useless in the final product and which may furthermore be harmful.

Le document US4094354 propose que les renforts à 0° soient préparés sous la forme d'une double bandelette de caoutchouc comprenant d'une part des renforts à 0° ondulés et d'autre part des fils tendus mais fragiles et destinés à être rompus lors de la conformation. Un problème de ce procédé est manifestement la complexité de la préparation de la double bandelette ainsi que le fait d'introduire des fils inutiles voire nuisibles dans le produit final.The document US4094354 proposes that reinforcements at 0 ° are prepared in the form of a double strip of rubber comprising on the one hand corrugated 0 ° reinforcements and secondly strained son but fragile and intended to be broken during the conformation. A problem with this process is obviously the complexity of the preparation of the double strip as well as the introduction of useless or even harmful threads into the final product.

Ainsi, malgré ces propositions, l'industrie du pneumatique n'a pas adopté ce type de procédé d'assemblage de l'ensemble de l'ébauche au diamètre du seat pour la fabrication des pneumatiques comportant des renforts de sommet à 0° et en particulier pour la fabrication des pneumatiques radiaux modernes.Thus, despite these proposals, the tire industry has not adopted this type of assembly method of the entire seat-diameter blank for the manufacture of tires comprising crown reinforcements at 0 ° and in particular for the manufacture of modern radial tires.

L'invention a donc pour objectif de pallier l'un au moins des inconvénients décrits ci-dessus.The invention therefore aims to overcome at least one of the disadvantages described above.

L'invention propose pour cela un procédé et une installation permettant la préparation et la pose au sein de l'ébauche de pneumatique d'une bandelette comprenant des renforts longitudinaux, ladite bandelette étant posée sous forme ondulée de sorte que la longueur des renforts longitudinaux est très sensiblement supérieure à la longueur de pose. On parle de « sur-longueur » pour désigner la différence entre la longueur de bandelette effectivement posée et la longueur parcourue sur la surface de pose.The invention proposes for this a method and an installation for the preparation and laying within the tire blank of a strip comprising longitudinal reinforcements, said strip being laid in undulated form so that the length of the longitudinal reinforcements is very significantly greater than the laying length. We speak of "over-length" to designate the difference between the length of strip actually posed and the length traveled on the laying surface.

Dans la présente demande, le terme « bandelette de renforcement » ou «bandelette» désigne une étroite bande de caoutchouc incluant des renforts longitudinaux et destinée à être posée par enroulement hélicoïdal au sein de l'ébauche d'un pneumatique. Les renforts peuvent par exemple être des câbles ou des monofilaments, en acier, en matériau minéral (fibre de verre ou de carbone), en fibre synthétique ou en matériau textile de manière connue en soi dans le domaine du pneumatique. Une bandelette comprend une pluralité de renforts, par exemple entre 3 et 10 renforts. Une telle bandelette a une largeur maximale de l'ordre de 15 à 20 mm selon la largeur totale de l'armature de frettage. De préférence encore, pour l'armature de frettage d'un pneumatique pour véhicule de tourisme, la bandelette a une largeur maximale de 11 mm. L'enroulement comprend une pluralité de tours, par exemple entre 10 et 30 tours pour constituer une armature de frettage complète.In the present application, the term "reinforcing strip" or "strip" means a narrow rubber band including longitudinal reinforcements and intended to be laid by helical winding within the blank of a tire. The reinforcements may for example be cables or monofilaments, made of steel, mineral material (fiberglass or carbon), synthetic fiber or textile material in a manner known per se in the field of pneumatics. A strip comprises a plurality of reinforcements, for example between 3 and 10 reinforcements. Such a strip has a maximum width of the order of 15 to 20 mm depending on the total width of the hooping frame. More preferably, for the hoop reinforcement of a tire for a passenger vehicle, the strip has a maximum width of 11 mm. The winding comprises a plurality of turns, for example between 10 and 30 turns to form a complete frettage reinforcement.

L'invention propose donc une installation pour la fabrication d'un pneumatique, ladite installation comprenant un tambour rotatif autour d'un axe de tambour, ledit tambour étant apte à supporter une ébauche de pneumatique, ledit tambour étant placé en regard d'un dispositif apte à :

  • transformer en continu une bandelette de renforcement plate en une bandelette de renforcement ondulée,
  • presser un à un les sommets des ondes de la bandelette ondulée sur la surface de l'ébauche de pneumatique entrainée en rotation par le tambour.
The invention thus proposes an installation for the manufacture of a tire, said installation comprising a rotary drum about a drum axis, said drum being able to support a tire blank, said drum being placed opposite a device able to :
  • continuously transforming a flat reinforcing strip into a corrugated reinforcing strip,
  • press one by one the peaks of the waves of the corrugated strip on the surface of the tire blank rotated by the drum.

Le dispositif comprend :

  • un transporteur continu apte à guider une pluralité de doigts le long d'un circuit fermé, lesdits doigts étant aptes à prendre appui sur une première face de la bandelette,
  • une platine rotative selon un axe de platine, ladite platine rotative portant une pluralité de galets rotatifs d'axes parallèles à l'axe de platine, lesdits galets étant répartis sur un cercle sensiblement concentrique à l'axe de platine, lesdits galets étant aptes à prendre appui sur une deuxième face de la bandelette,
  • des moyens de guidage de la bandelette de renforcement plate entrant dans le dispositif,
  • des moyens de synchronisation de la rotation de la platine rotative et de l'avancement du transporteur continu,
le circuit fermé comportant une portion d'interférence dans laquelle les moyens de synchronisation permettent aux doigts et aux galets de se déplacer selon des mouvements de rotation dans un plan commun perpendiculaire à l'axe de platine, les doigts et les galets étant intercalés dans ladite portion d'interférence de manière à imposer à la bandelette des ondes s'étendant dans ledit plan commun.The device comprises:
  • a continuous conveyor capable of guiding a plurality of fingers along a closed circuit, said fingers being able to bear on a first face of the strip,
  • a turntable according to a platinum axis, said rotary plate carrying a plurality of rotary rollers of axes parallel to the platinum axis, said rollers being distributed on a circle substantially concentric with the platinum axis, said rollers being suitable for take support on a second face of the strip,
  • means for guiding the flat reinforcing strip entering the device,
  • means for synchronizing the rotation of the turntable and the advancement of the continuous conveyor,
the closed circuit comprising an interference portion in which the synchronization means allow the fingers and rollers to move in rotational movements in a common plane perpendicular to the platinum axis, the fingers and the rollers being interposed in said portion of interference so as to impose on the strip waves extending in said common plane.

De préférence encore, le transporteur continu est une chaîne guidée par un pignon d'interférence dans la portion d'interférence du circuit fermé.More preferably, the continuous conveyor is a chain guided by an interference pinion in the interference portion of the closed circuit.

De préférence encore, les doigts sont portés par les axes des maillons de la chaîne.More preferably, the fingers are carried by the axes of the links of the chain.

De préférence encore, le dispositif comprend en outre un dérive-bandelette statique positionné dans la portion d'interférence pour pouvoir dériver la bandelette des doigts, de préférence au moins un quart de tour après le début de la portion d'interférence.More preferably, the device further comprises a static strip-drift positioned in the interference portion to be able to derive the strip from the fingers, preferably at least a quarter of a turn after the start of the interference portion.

De préférence encore, le dispositif comprend en outre des moyens de rouletage de la bandelette ondulée.More preferably, the device further comprises means for rolling the corrugated strip.

De préférence encore, le dispositif comprend en outre un cabestan motorisé apte à contrôler son alimentation en bandelette plate.More preferably, the device further comprises a motorized capstan adapted to control its supply flat strip.

L'invention propose également un procédé de fabrication d'un pneumatique réalisé par une telle installation, ledit procédé comprenant successivement des étapes consistant à :

  • transformer en continu une bandelette de renforcement plate (20) en une bandelette de renforcement ondulée (21),
  • presser un à un les sommets (211) des ondes de la bandelette ondulée sur la surface (501) d'une ébauche de pneumatique (50) entrainée en rotation par un tambour (3) autour d'un axe de tambour (32),
  • enrouler la bandelette ondulée sur l'ébauche de pneumatique,
dans lequel la bandelette de renforcement plate est transformée en bandelette ondulée à proximité immédiate du tambour, les ondes de la bandelette ondulée et le mouvement d'approche des sommets des ondes vers la surface de l'ébauche s'étendent dans un plan sensiblement perpendiculaire à l'axe de tambour.The invention also proposes a method for manufacturing a tire produced by such an installation, said method comprising successively stages comprising:
  • continuously transforming a flat reinforcing strip (20) into a corrugated reinforcing strip (21),
  • pressing one by one the vertices (211) of the waves of the corrugated strip on the surface (501) of a tire blank (50) rotated by a drum (3) about a drum axis (32),
  • wrap the corrugated strip on the tire blank,
wherein the flat reinforcing strip is formed into a corrugated strip in close proximity to the drum, the waves of the corrugated strip and the approaching motion of the wave peaks towards the surface of the blank extend in a plane substantially perpendicular to the drum axis.

De préférence, on enroule la bandelette ondulée en hélice sur l'ébauche de pneumatique afin de constituer en une pluralité de tours une armature de frettage du sommet du pneumatique, la bandelette ondulée présentant une sur-longueur donnée permettant la conformation de l'ébauche.Preferably, the helically corrugated strip is wound on the tire blank in order to form a reinforcement frame of the crown of the tire in a plurality of turns, the corrugated strip having a given over-length allowing the conformation of the blank.

De préférence encore, le procédé comprend en outre une étape de rouletage consistant à rabattre en continu les ondes de la bandelette ondulée au cours de l'enroulement de la bandelette sur l'ébauche, le mouvement de rabattage des ondes vers la surface de l'ébauche s'effectuant dans un plan sensiblement perpendiculaire à l'axe de tambour.More preferably, the method further comprises a rolling step of continuously folding the waves of the corrugated strip during the winding of the strip on the blank, the wave folding movement towards the surface of the roughing taking place in a plane substantially perpendicular to the drum axis.

De préférence encore, on fait varier la hauteur des ondes au cours de l'enroulement.More preferably, the wave height is varied during winding.

La description qui suit permet de mieux comprendre le procédé selon l'invention ainsi que la structure et le fonctionnement d'une installation selon des modes préférés de réalisation de l'invention et s'appuie sur les figures 1 à 10 dans lesquelles :

  • la figure 1 est une vue schématique représentant le principe du procédé de l'invention et un premier mode de réalisation d'une installation selon l'invention au cours de son utilisation,
  • la figure 2 est une vue schématique en perspective du dispositif de la figure 1,
  • la figure 3 est une vue en détail du fonctionnement du dispositif de la figure 1,
  • la figure 4 est une vue en coupe d'un exemple de réalisation du support des doigts du dispositif de la figure 1,
  • la figure 5 est une vue en coupe d'un exemple de réalisation du support des galets sur la platine rotative du dispositif de la figure 1,
  • les figures 6 et 7 sont des vues schématiques en perspective montrant deux exemples similaires d'ébauche de pneumatique obtenu par le procédé de l'invention,
  • les figures 8 et 9 illustrent en perspective et en vue de dessus un mode de réalisation préféré du dispositif de la figure 1.
  • la figure 10 est une vue schématique représentant le procédé de l'invention mis en oeuvre sur un deuxième mode de réalisation d'une installation selon l'invention.
The description which follows makes it possible to better understand the process according to the invention as well as the structure and operation of an installation according to preferred embodiments of the invention and is based on the Figures 1 to 10 in which :
  • the figure 1 is a schematic view showing the principle of the method of the invention and a first embodiment of an installation according to the invention during its use,
  • the figure 2 is a schematic perspective view of the device of the figure 1 ,
  • the figure 3 is a detailed view of the operation of the device of the figure 1 ,
  • the figure 4 is a sectional view of an exemplary embodiment of the finger support of the device of the figure 1 ,
  • the figure 5 is a sectional view of an exemplary embodiment of the support of the rollers on the rotating plate of the device of the figure 1 ,
  • the Figures 6 and 7 are schematic perspective views showing two similar examples of tire blank obtained by the method of the invention,
  • the Figures 8 and 9 illustrate in perspective and in top view a preferred embodiment of the device of the figure 1 .
  • the figure 10 is a schematic view showing the method of the invention implemented on a second embodiment of an installation according to the invention.

Sur les différentes figures, les éléments identiques ou similaires portent les mêmes références. La description de la structure et de la fonction de ces éléments identiques ou similaires n'est donc pas systématiquement reprise.In the different figures, identical or similar elements bear the same references. The description of the structure and function of these identical or similar elements is therefore not systematically repeated.

Sur la figure 1, on voit les principes essentiels du procédé et de l'installation selon l'invention.On the figure 1 we see the essential principles of the process and the installation according to the invention.

Le procédé de l'invention est un procédé essentiellement continu qui consiste tout d'abord à transformer une bandelette de renforcement plate 20 en une bandelette ondulée 21 puis à la poser sous forme ondulée sur une ébauche de pneumatique 50. Ces deux étapes se déroulent successivement et de préférence à proximité immédiate l'une de l'autre. Progressivement, on réalise un enroulement de plusieurs tours de cette bandelette ondulée sur l'ébauche. Les ondes de la bandelette ondulée 21 ainsi que le mouvement d'approche vers la surface de l'ébauche s'étendent dans un plan perpendiculaire à l'axe de l'ébauche de pneumatique, c'est à dire un plan perpendiculaire à l'axe 32 du tambour 3 qui supporte et contrôle la rotation de l'ébauche 50. On comprend que l'enroulement est réalisé en hélice de manière connue en soi afin de confectionner une armature de frettage sur une largeur donnée, cette largeur étant définie le plus souvent par rapport à la largeur prévue de la bande de roulement du pneumatique.The method of the invention is a substantially continuous process which first consists of transforming a flat reinforcing strip 20 into a corrugated strip 21 and then placing it in undulating form on a tire blank 50. These two steps take place successively. and preferably in close proximity to one another. Gradually, a winding of several turns of this corrugated strip is made on the blank. The waves of the corrugated strip 21 and the approach movement towards the surface of the blank extend in a plane perpendicular to the axis of the tire blank, that is to say a plane perpendicular to the axis 32 of the drum 3 which supports and controls the rotation of the blank 50. It is understood that the winding is made in a helix in a manner known per se to making a hooping reinforcement over a given width, this width being defined most often with respect to the expected width of the tread of the tire.

De préférence, le procédé comprend en outre et comme représenté ici une étape de rouletage consistant à transformer la bandelette ondulée 21 en une bandelette ondulée rouletée 22, c'est à dire une bandelette dont les ondes ont été rabattues sur l'ébauche après y avoir été posées. On voit bien sur cette figure que la longueur de la bandelette posée sur l'ébauche (et donc la longueur des renforts longitudinaux qu'elle contient) et très sensiblement supérieure à la longueur de pose parcourue sur la surface de l'ébauche 50.Preferably, the method further comprises and as shown here a rolling step of transforming the corrugated strip 21 into a rolled corrugated strip 22, that is to say a strip whose waves have been folded on the blank after having been asked. This figure clearly shows that the length of the strip placed on the blank (and therefore the length of the longitudinal reinforcements it contains) and very substantially greater than the laying length traveled on the surface of the blank 50.

Le procédé de l'invention n'implique donc pas de stockage ni de gestion d'un produit semi-fini intermédiaire. La bandelette ondulée est au contraire enroulée directement au sein de l'ébauche dès que l'étape qui lui confère sa forme ondulée a été réalisée.The method of the invention therefore does not involve storage or management of an intermediate semi-finished product. On the contrary, the corrugated strip is wound directly into the blank as soon as the step which gives it its undulating shape has been performed.

Afin de donner à l'ensemble de l'enroulement une rigidité homogène, il peut être préférable d'enrouler le premier et le dernier tour de bandelette sans déplacement axial et donc sur lui-même. De même, pour obtenir une densité de renfort suffisante, il peut être préférable d'enrouler successivement une pluralité de couches d'armature de frettage selon le principe de l'invention.In order to give the entire winding a homogeneous rigidity, it may be preferable to wind the first and the last round of strip without axial displacement and therefore on itself. Similarly, to obtain a sufficient reinforcement density, it may be preferable to successively wind a plurality of shrink frame layers according to the principle of the invention.

L'installation 2 permet de mettre en oeuvre ce procédé. Elle comprend le tambour d'assemblage 3 et un dispositif de préparation et de pose de la bandelette. Ce dispositif 1 permet dans un premier temps la transformation in situ d'une bandelette de renforcement plate 20 en une bandelette ondulée 21 et dans un deuxième temps la pose de la bandelette sous forme ondulée sur une ébauche de pneumatique 50. De préférence, le dispositif permet dans un troisième temps de transformer la bandelette ondulée 21 en une bandelette ondulée rouletée 22, c'est à dire une bandelette dont les ondes ont été rabattues sur la surface 31 de l'ébauche 50.The installation 2 makes it possible to implement this method. It comprises the assembly drum 3 and a device for preparing and laying the strip. This device 1 allows, in a first step, the in situ transformation of a flat reinforcement strip 20 into a corrugated strip 21 and, in a second step, the laying of the strip in undulated form on a tire blank 50. Preferably, the device allows in a third time to transform the corrugated strip 21 into a rolled corrugated strip 22, that is to say a strip whose waves have been folded on the surface 31 of the blank 50.

Pour ce faire, le dispositif 1 comprend un circuit fermé le long duquel circulent des doigts 5 selon le sens indiqué sur la figure par les flèches. Les doigts sont guidés le long du circuit par un transporteur continu indexé 4 comme par exemple une chaîne ou une courroie crantée. Le transporteur continu est animé ici par un motoréducteur de transporteur 42. Une platine rotative 6 porte des galets 7 répartis à sa périphérie sur un cercle 61 concentrique à l'axe de rotation AP de la platine rotative. La rotation de la platine est contrôlée par un motoréducteur de platine 62.To do this, the device 1 comprises a closed circuit along which fingers move in the direction indicated in the figure by the arrows. The fingers are guided along the circuit by a continuous indexed conveyor 4 such as a chain or a toothed belt. The continuous conveyor is animated here by a transporter gearmotor 42. A rotating plate 6 carries rollers 7 distributed at its periphery on a circle 61 concentric to the axis of rotation AP of the rotating plate. The rotation of the plate is controlled by a platinum gear motor 62.

Des moyens de synchronisation permettent de contrôler la vitesse des deux motoréducteurs de manière à ce que le déplacement des doigts 5 le long du circuit soit coordonné avec le déplacement des galets 7 de la platine, en particulier dans une portion d'interférence PI dans laquelle les doigts et les galets peuvent ainsi se déplacer dans un plan commun perpendiculaire à l'axe de platine AP et à l'axe du tambour 32. Les doigts 5 prennent appui sur la face supérieure de la bandelette alors que les galets 7 prennent appui sur la face inférieure de la bandelette. Lors du fonctionnement du dispositif, on comprend que les galets de la platine viennent s'intercaler entre les doigts et forcent progressivement la bandelette à prendre une forme ondulée 21.Synchronization means make it possible to control the speed of the two geared motors so that the displacement of the fingers 5 along the circuit is coordinated with the displacement of the rollers 7 of the plate, in particular in a PI interference portion in which the fingers and the rollers can thus move in a common plane perpendicular to the platinum axis AP and the axis of the drum 32. The fingers 5 bear on the upper face of the strip while the rollers 7 are supported on the underside of the strip. During operation of the device, it is understood that the rollers of the plate are interposed between the fingers and gradually force the strip to take an undulating form 21.

Le dispositif 1 est placé face à l'ébauche de pneumatique 50 portée par le tambour rotatif d'assemblage 3 de manière à ce que les galets de la platine rotative viennent l'un après l'autre s'approcher de la surface 501 de l'ébauche. Le fonctionnement du dispositif décrit ci-dessus est synchronisé avec la rotation du tambour. Les sommets 211 des ondes de la bande ondulée 21 peuvent alors venir en contact et être pressés un à un contre la surface de l'ébauche 501. La bandelette en caoutchouc peut ainsi adhérer ponctuellement à la surface en mouvement de l'ébauche et être ensuite entraînée par celle-ci.The device 1 is placed facing the tire blank 50 carried by the rotary assembly drum 3 so that the rollers of the turntable come one after the other approaching the surface 501 of the 'draft. The operation of the device described above is synchronized with the rotation of the drum. The vertices 211 of the waves of the corrugated strip 21 can then come into contact and be pressed one by one against the surface of the blank 501. The rubber strip can thus adhere punctually to the moving surface of the blank and then be driven by it.

Le dispositif 1 comprend de préférence un dérive-bandelette fixe 63 dont la fonction est de faire échapper axialement la bandelette 21 des doigts une fois que la bandelette ondulée est liée à l'ébauche. La bandelette est alors entrainée par l'ébauche et s'y enroule tout en échappant au contrôle des doigts et des galets du dispositif. Le dérive-bandelette agit dans la portion d'interférence PI, de préférence au moins un quart de tour après le début de celle-ci.The device 1 preferably comprises a fixed strip-drift 63 whose function is to axially escape the strip 21 of the fingers once the corrugated strip is bonded to the blank. The strip is then driven by the blank and rolls while escaping the control of fingers and rollers of the device. The strip drift acts in the interference portion PI, preferably at least a quarter of a turn after the start thereof.

De préférence encore, des moyens de rouletage 30 permettent de rabattre les ondes de la bandelette ondulée 21 en les plaquant contre la surface de l'ébauche. La bandelette ondulée rouletée 22 est ainsi encore mieux fixée quant à sa position et quant à l'orientation longitudinale de ses renforts ce qui permet d'assurer la meilleure répartition de la sur-longueur des renforts sur la circonférence de l'ébauche.More preferably, rolling means 30 make it possible to fold down the waves of the corrugated strip 21 by pressing them against the surface of the blank. The rolled corrugated strip 22 is thus still better fixed with respect to its position and to the longitudinal orientation of its reinforcements, which makes it possible to ensure the best distribution of the over-length of the reinforcements on the circumference of the blank.

La figure 2 en perspective permet de mieux visualiser les éléments constitutifs de ce mode de réalisation préféré de l'installation. En particulier, si l'on compare les figures 1 et 2, on voit bien le principe des moyens qui assurent le guidage de la bandelette plate entrant dans le dispositif. Une poulie de guidage 9 placée dans le plan et à l'intérieur du circuit fermé 4 guide la bandelette plate vers la portion d'interférence PI des doigts et des galets. La poulie de guidage 9 reçoit la bandelette d'une poulie d'alimentation 10 également placée dans le plan du circuit des doigts mais orientée de manière à recevoir la bandelette depuis l'extérieur, par exemple depuis l'arrière de la figure 1 dans ce mode de réalisation. On voit aussi que la bandelette 20 est vrillée d'environ un quart de tour entre les deux poulies.The figure 2 in perspective allows to better visualize the constituent elements of this preferred embodiment of the installation. In particular, if we compare figures 1 and 2 , we see the principle of the means that ensure the guidance of the flat strip entering the device. A guide pulley 9 placed in the plane and inside the closed circuit 4 guides the flat strip towards the interference portion PI fingers and rollers. The guide pulley 9 receives the strip of a feed pulley 10 also placed in the plane of the finger circuit but oriented to receive the strip from the outside, for example from the back of the figure 1 in this embodiment. We also see that the strip 20 is twisted about a quarter turn between the two pulleys.

Sur la figure 2 on voit également bien le principe d'entrainement des doigts 5 par le transporteur continu 4, ici sous la forme d'une chaîne 41. La chaîne 41 circule autour de deux pignons 411 et 412. Le pignon moteur 411 est entrainé par le moteur de transporteur 42. Le pignon d'interférence 412 est entrainé en rotation par la chaîne et a pour seule fonction de guider la chaîne et donc de guider les doigts 5 en regard des galets 7 de la platine 6. Comme discuté plus haut, le déplacement de la chaîne doit se faire en parfaite synchronisation avec la rotation de la platine 6 portant les galets 7. Cette synchronisation est garantie par les moyens de synchronisation, par exemple par un contrôle commun des deux moteurs électriques 42 et 62. Alternativement, le pignon d'interférence 412 peut être entrainé en rotation par le même moteur que la platine rotative. Du fait que le pignon 412 n'est pas nécessairement coaxial avec l'axe de platine, l'entrainement peut de préférence se faire par l'intermédiaire d'un joint d'Oldham ou d'un arbre équipé de joints homocinétiques.On the figure 2 the drive principle of the fingers 5 is also clearly seen by the continuous conveyor 4, here in the form of a chain 41. The chain 41 circulates around two pinions 411 and 412. The driving pinion 411 is driven by the drive motor. carrier 42. The interference pinion 412 is rotated by the chain and has the sole function of guiding the chain and thus guiding the fingers 5 opposite the rollers 7 of the plate 6. As discussed above, the movement of the chain must be in perfect synchronization with the rotation of the plate 6 carrying the rollers 7. This synchronization is guaranteed by the synchronization means, for example by a common control of the two electric motors 42 and 62. Alternatively, the pinion of interference 412 can be rotated by the same motor as the turntable. Since the pinion 412 is not necessarily coaxial with the platinum axis, the drive may preferably be via an Oldham seal or a shaft equipped with homokinetic joints.

Sur la figure 2, on voit également qu'une embase 16 mobile par rapport à un bâti 17 permet de contrôler la position de l'ensemble des éléments du dispositif relativement au tambour et donc à l'ébauche et permet également de contrôler la pression avec laquelle la bandelette ondulée 21 est appliquée par les galets sur la surface de l'ébauche. Les moyens de rouletage, ici sous la forme d'un rouleau presseur 30, sont également portées par l'embase mobile 16, par exemple par l'intermédiaire d'un vérin pneumatique 31 (voir aussi figure 1) leur imprimant une force d'appui élastique. La position de l'embase mobile 16 est ici contrôlée par un vérin électrique 19.On the figure 2 it is also seen that a base 16 movable relative to a frame 17 makes it possible to control the position of all the elements of the device relative to the drum and therefore to the blank and also makes it possible to control the pressure with which the corrugated strip 21 is applied by the rollers on the surface of the blank. The rolling means, here in the form of a pressure roller 30, are also carried by the mobile base 16, for example by means of a pneumatic cylinder 31 (see also figure 1 ) impressing them with an elastic support force. The position of the mobile base 16 is here controlled by an electric jack 19.

Un coulisseau 15 lui-même mobile par rapport à l'embase 16 supporte les deux pignons 411 et 412 du transporteur continu. On comprend qu'en déplaçant légèrement ce coulisseau par rapport au support de la platine rotative (et donc par rapport à l'axe de platine AP), on peut faire varier la hauteur des ondes imposées à la bandelette. De cette manière on peut faire varier précisément la sur-longueur donnée à la bandelette ondulée. Le déplacement du coulisseau 15 est ici contrôlé par un vérin électrique de coulisseau 18. Afin de donner une indication d'ordre de grandeur, on peut dire qu'une sur-longueur de 50% est obtenue lorsque les ondes ont une hauteur (amplitude) d'environ 11 mm.A slider 15 itself movable relative to the base 16 supports the two gears 411 and 412 of the continuous conveyor. It is understood that by slightly moving this slider relative to the support of the turntable (and thus relative to the platinum axis AP), it is possible to vary the height of the waves imposed on the strip. In this way it is possible to precisely vary the over-length given to the corrugated strip. The displacement of the slider 15 is here controlled by an electric ram jack 18. In order to give an order of magnitude, it can be said that an over-length of 50% is obtained when the waves have a height (amplitude) of about 11 mm.

La figure 3 montre à une plus grande échelle le principe de ce mode de réalisation concernant la formation des ondes par la coopération des doigts 5 et des galets 7 dans la portion d'interférence. On y voit également bien le principe du dérive-bandelette 63 (sous la forme d'une came statique) qui a pour fonction de dévier la bandelette pour la faire échapper du doigt 5 après qu'elle a été pressée contre l'ébauche (non représentée ici). Pour cela, le dérive-bandelette comprend un plan incliné le long duquel glisse le bord de la bandelette ondulé 21. On comprend qu'à ce stade du procédé, la bandelette est déjà associée à l'ébauche.The figure 3 shows on a larger scale the principle of this embodiment concerning the formation of waves by the cooperation of the fingers 5 and rollers 7 in the interference portion. It also shows the principle of the drift-strip 63 (in the form of a static cam) which has the function of deflecting the strip to escape from the finger 5 after it has been pressed against the blank (no represented here). For this, the strip-drift comprises an inclined plane along which the edge of the corrugated strip 21 slides. It is understood that at this stage of the method, the strip is already associated with the blank.

La figure 4 montre à plus grande échelle encore un détail de ce mode de réalisation du dispositif et particulièrement d'un mode de réalisation du transporteur continu et des doigts. Les axes 413 des maillons de la chaine 41 supportent les doigts 5 montés à rotation sur lesdits axes par l'intermédiaire de roulements à billes 414. Les doigts 5 sont donc libres de tourner par rapport à leurs supports afin de permettre à la bandelette de circuler pour former ses ondes en imposant le moins d'efforts possible au dispositif (et à la bandelette elle-même).The figure 4 shows on a larger scale still a detail of this embodiment of the device and particularly of an embodiment of the continuous conveyor and fingers. The axes 413 of the links of the chain 41 support the fingers 5 rotatably mounted on said axes by means of ball bearings 414. The fingers 5 are therefore free to rotate relative to their supports to allow the strip to circulate. to form its waves by imposing the least possible effort on the device (and the tape itself).

La figure 5 montre à grande échelle un détail de ce mode de réalisation de l'invention et particulièrement des galets 7 portés par la platine rotative 6. Les galets sont montés à rotation sur la platine par l'intermédiaire de paliers (par exemple des paliers lisses). Comme les doigts, les galets sont libres de tourner par rapport à leurs supports afin de permettre à la bandelette de circuler pour former ses ondes en imposant le moins d'efforts possible au dispositif (et à la bandelette elle-même).The figure 5 shows on a large scale a detail of this embodiment of the invention and particularly of the rollers 7 carried by the rotating plate 6. The rollers are rotatably mounted on the plate by means of bearings (for example plain bearings). Like the fingers, the rollers are free to rotate relative to their supports in order to allow the strip to circulate to form its waves by imposing the least possible effort on the device (and the strip itself).

L'installation permet donc de mettre en oeuvre le procédé selon l'invention consistant à préparer une bandelette ondulée comportant une sur-longueur contrôlée, la bandelette ondulée étant ensuite enroulée sous sa forme ondulée directement sur l'ébauche d'un pneumatique au cours de sa confection. La pose directe sur l'ébauche permet de garantir la précision de la pose en particulier en ce qui concerne la valeur de la sur-longueur des renforts et la répartition régulière de cette sur-longueur sur la circonférence de l'ébauche. On enroule donc en hélice un nombre adapté de tours de la bandelette ondulée afin de constituer l'armature de frettage du pneumatique. Cet enroulement peut se faire au diamètre du seat comme décrit plus haut en préambule de la demande puisque la sur-longueur des renforts de la bandelette ondulée autorise ensuite l'ébauche à être conformée, c'est à dire à prendre la forme pratiquement finale d'un pneumatique, avant que lesdits renforts à 0° soient réellement mis en tension.The installation therefore makes it possible to implement the method according to the invention of preparing a corrugated strip having a controlled over-length, the corrugated strip then being wound in its corrugated form directly on the blank of a tire during his confection. The direct laying on the blank makes it possible to guarantee the accuracy of the laying, in particular as regards the value of the over-length of the reinforcements and the regular distribution of this over-length on the circumference of the blank. A suitable number of turns of the corrugated strip are thus wound in a helix so as to constitute the hooping reinforcement of the tire. This winding can be done to the diameter of the seat as described above in the preamble of the application since the over-length of the reinforcements of the corrugated strip then allows the blank to be shaped, that is to say, to take the practically final form of a tire, before said reinforcements at 0 ° are actually put in tension.

Au cours de l'enroulement en hélice autour de l'ébauche, on peut en outre faire varier la valeur de la sur-longueur de la bandelette grâce au contrôle de la position du coulisseau 15. On peut par exemple prévoir que la sur-longueur soit plus importante au centre qu'aux épaules de la bande de roulement de sorte qu'un certain galbe est donné au pneumatique lors de la conformation de l'ébauche complète.During the helical winding around the blank, it is also possible to vary the value of the over-length of the strip by controlling the position of the slider 15. It may for example be provided that the over-length is greater in the center than the shoulders of the tread so that a certain curve is given to the tire during the shaping of the complete blank.

A la figure 6, on a représenté schématiquement un exemple d'ébauche de pneumatique 50 obtenue selon l'invention. On a voulu en particulier montrer ici l'armature de frettage disposée au sein d'une ébauche au cours de la fabrication d'un pneumatique. Le tambour sur lequel a été assemblé l'ébauche jusqu'à ce stade n'est pas représenté. On reconnaît les renforts à 0° disposés sous la forme d'une bandelette ondulée 21 telle que formée par le procédé de l'invention. Les ondes de la bandelette s'étendent dans un plan perpendiculaire à l'axe de l'ébauche (en négligeant l'angle d'hélice de l'enroulement comme discuté plus haut). Les ondes de la bandelette sont donc dans un plan parallèle au plan équatorial du pneumatique qui sera obtenu à partir de cette ébauche. Une quinzaine de tours ont été enroulés autour de l'ébauche afin de constituer l'armature de frettage complète.To the figure 6 schematically an example of tire blank 50 obtained according to the invention is shown schematically. In particular, it was desired to show here the shrink reinforcement disposed within a blank during the manufacture of a tire. The drum on which the blank has been assembled until this stage is not shown. 0 ° reinforcements are recognized in the form of a corrugated strip 21 as formed by the method of the invention. The waves of the strip extend in a plane perpendicular to the axis of the blank (neglecting the helix angle of the winding as discussed above). The waves of the strip are therefore in a plane parallel to the equatorial plane of the tire which will be obtained from this blank. About fifteen turns were wrapped around the blank to form the complete hooping frame.

On voit également la couche 51 contenant les renforts de carcasse et les bourrelets 52 contenant les renforts de bourrelets (souvent appelés « tringles »). Des nappes de renforts de sommet peuvent être placées sous l'armature de frettage. Une couche de gomme d'étanchéité 53 est de préférence présente à l'intérieur de la carcasse 51. Les bandelettes de renforts à 0° sont représentées ici sous la forme ondulée 21 mais non rouletée (référencée 22 sur les figures précédentes) afin de faciliter la lecture du dessin. On comprend que la forme rouletée peut être préférée pour améliorer la précision du positionnement des renforts dans la suite du procédé comme décrit plus haut. Une bande de roulement et des gommes de protection des flancs peuvent ensuite être ajoutées à cette ébauche de manière connue en soi. Tous les constituants du futur pneumatique peuvent ainsi être posés au même diamètre réduit, c'est à dire sur un même tambour au diamètre du seat et donc sans conformation intermédiaire.We also see the layer 51 containing the carcass reinforcements and the beads 52 containing the bead reinforcements (often called "rods"). Top reinforcement plies may be placed under the hoop reinforcement. A layer of sealing rubber 53 is preferably present inside the carcass 51. The reinforcing strips at 0 ° are represented here in the undulating form 21 but not rolled (referenced 22 in the previous figures) in order to facilitate reading the drawing. It is understood that the rolled shape may be preferred to improve the accuracy of the positioning of the reinforcements in the following process as described above. A tread and sidewall protectors can then be added to this blank in a manner known per se. All the components of the future tire can thus be placed at the same reduced diameter, that is to say on the same drum to the diameter of the seat and therefore without intermediate conformation.

Alternativement, le tambour de pose peut également avoir un diamètre légèrement supérieur au diamètre du seat s'il comprend des gorges pour recevoir les bourrelets de l'ébauche. On obtient alors plutôt une ébauche telle que représentée à la figure 7.Alternatively, the laying drum may also have a diameter slightly greater than the diameter of the seat if it includes grooves for receiving the beads of the blank. We then obtain rather a draft as represented in figure 7 .

Dans un cas comme dans l'autre, une fois posés tous les éléments constitutifs d'un pneumatique, l'ébauche complète ainsi constituée peut alors être placée dans une presse de vulcanisation, conformée puis moulée et vulcanisée de manière connue en soi.In either case, once all the constituent elements of a tire have been laid down, the complete blank thus formed can then be placed in a vulcanization press, shaped and then molded and vulcanized in a manner known per se.

De préférence, l'alimentation du dispositif en bandelette plate fait l'objet d'un contrôle précis de son débit. Ceci peut être obtenu grâce à l'utilisation d'un cabestan motorisé 100 comme représenté aux figures 8 et 9. Sur ces figures, on voit la bandelette plate 20 être guidée autour de la poulie 101 du cabestan, la rotation de cette poulie étant contrôlée par le moteur de cabestan 102. De préférence encore, une sangle 103 tendue entre des renvois 104 vient plaquer la bandelette sur la poulie de cabestan afin de lui interdire tout glissement intempestif. La vitesse de rotation du cabestan, c'est à dire la vitesse de la bandelette plate alimentant le dispositif, peut être contrôlée précisément en fonction de la vitesse de rotation de l'ébauche afin de contrôler tout aussi précisément la sur-longueur des renforts posés, y compris de manière dynamique au cours de l'enroulement en hélice de la bandelette ondulée comme décrit plus haut.Preferably, the feeding of the flat strip device is subject to a precise control of its flow. This can be achieved through the use of a motorized capstan 100 as shown in FIGS. Figures 8 and 9 . In these figures, we see the flat strip 20 to be guided around the pulley 101 of the capstan, the rotation of this pulley being controlled by the capstan motor 102. More preferably, a strap 103 stretched between refits 104 comes to press the strip on the capstan pulley to prevent any inadvertent sliding. The speed of rotation of the capstan, ie the speed of the flat strip feeding the device, can be precisely controlled according to the speed of rotation of the blank to control just as precisely the over-length of the reinforcements placed , including dynamically during helical winding of the corrugated strip as described above.

Afin de s'adapter aux variations de longueurs délivrées par le cabestan, le décalage entre l'axe de platine AP et l'axe du pignon d'interférence peut s'adapter passivement au moyen par exemple d'un simple ressort tendant à reculer le coulisseau 15 ou activement par l'intermédiaire d'une gestion basée sur un mesure de la tension effective de la bandelette.In order to adapt to the length variations delivered by the capstan, the offset between the platinum axis AP and the axis of the interference pinion can be adapted passively by means, for example, of a simple spring tending to move back the slider 15 or actively through a management based on a measurement of the effective tension of the strip.

A la figure 10, on a représenté un autre mode de réalisation du dispositif de préparation et de pose de la bandelette. Ce dispositif 200 comprend 2 pignons 201 et 202 dont les dents engrènent et coopèrent pour déformer la bandelette plate 20 et la transformer en bandelette ondulée 21. De préférence, la bandelette est maintenue plaquée au fond des dents par une dépression régnant dans les canaux 203. Ces canaux sont en dépression tant qu'ils sont en communication avec le secteur fixe 204 lui-même connecté à une source de vide. Les sommets 211 des ondes de la bandelette sont pressés un a un par les dents du pignon 202 contre la surface 501 de l'ébauche 50 d'une manière comparable à ce qui a été décrit avec le dispositif des figures précédentes. Une fois les sommets entrainés par l'ébauche, la dépression peut même être remplacée par une légère pression afin d'aider la bandelette à quitter le fond des dents.To the figure 10 another embodiment of the device for preparing and laying the strip is shown. This device 200 comprises two pinions 201 and 202 whose teeth mesh and cooperate to deform the flat strip 20 and turn it into a corrugated strip 21. Preferably, the strip is kept pressed to the bottom of the teeth by a depression in the channels 203. These channels are in depression as long as they are in communication with the fixed sector 204 itself connected to a source of vacuum. The vertices 211 of the waves of the strip are pressed one by one by the teeth of the pinion 202 against the surface 501 of the blank 50 in a manner comparable to that described with the device of the preceding figures. Once the tops are trained by the rough, the depression can even be replaced by a slight pressure to help the strip to leave the bottom of the teeth.

Claims (10)

  1. Installation (2) for the manufacture of a tire, said installation comprising a rotary drum (3) that rotates about a drum axis (32), said drum being able to carry a tyre blank, said drum being placed next to a device (1) that is able to:
    - continuously convert a flat reinforcing strip (20) into an undulating reinforcing strip (21),
    - press the peaks of the waves of the undulating strip one by one onto the surface of the tyre blank (3) that is driven in rotation by the drum,
    the installation being characterized in that the device (1) comprises:
    - a continuous transporter (4) that is able to guide a plurality of fingers (5) along a closed circuit, said fingers being able to bear against a first face of the strip,
    - a rotary support plate that rotates about a support plate axis (AP), said rotary support plate (6) bearing a plurality of rotary rollers (7) having axes parallel to the support plate axis, said rollers being distributed in a circle (61) substantially concentric with the support plate axis, said rollers being able to bear against a second face of the strip,
    - guide means (9, 10) for guiding the flat reinforcing strip entering the device,
    - means for synchronizing the rotation of the rotary support plate and the forward motion of the continuous transporter,
    the closed circuit having an intersecting portion (PI) in which the synchronizing means allow the fingers and the rollers to move in rotational movements in a common plane perpendicular to the support plate axis, the fingers and the rollers being interposed in said intersecting portion so as to impose waves on the strip that extend in said common plane.
  2. Installation according to claim 1, wherein the continuous transporter is a chain (41) guided by an intersecting sprocket (412) in the intersecting portion (PI) of the closed circuit.
  3. Installation according to claim 2, wherein the fingers (5) are carried by the pins (413) of the links of the chain.
  4. Installation according to one of claims 1 to 3, wherein the device also comprises a static strip diverter positioned in the intersecting portion (PI) in order to be able to divert the strip from the fingers (5), preferably at least a quarter turn after the start of the intersecting portion.
  5. Installation according to one of claims 1 to 4, wherein the device also comprises stitching means (30, 31) for stitching the undulating strip.
  6. Installation according to one of claims 1 to 5, wherein the device also comprises a motorized winch (100) that is able to control the supply thereof with flat strip.
  7. Method for manufacturing a tyre effected by the installation according to one of claims 1 to 6, said method successively comprising the steps of:
    - continuously converting a flat reinforcing strip (20) into an undulating reinforcing strip (21),
    - pressing the peaks (211) of the waves of the undulating strip one by one onto the surface (501) of a tyre blank (50) that is driven in rotation by a drum (3) about a drum axis (32),
    - winding the undulating strip onto the tyre blank,
    wherein the flat reinforcing strip is converted into an undulating strip in the immediate vicinity of the drum, the waves of the undulating strip and the movement of the wave peaks towards the surface of the blank extending in a plane substantially perpendicular to the drum axis.
  8. Method for manufacturing a tyre according to claim 7, wherein the undulating strip is wound helically onto the tyre blank so as to form, in a plurality of turns, a hoop reinforcement of the crown of the tyre, the undulating strip having a given overlength allowing the blank to be shaped.
  9. Method for manufacturing a tyre according to claim 7 or claim 8, also comprising a step of stitching that consists in continuously folding down the waves of the undulating strip while the strip is being wound onto the blank, the movement of folding the waves down towards the surface of the blank being carried out in a plane substantially perpendicular to the drum axis.
  10. Method according to one of claims 7 to 9, wherein the height of the waves is varied during winding.
EP15729769.8A 2014-06-30 2015-05-29 Method and apparatus for assembling a tire blank Active EP3160724B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1456169A FR3022832B1 (en) 2014-06-30 2014-06-30 METHOD AND INSTALLATION FOR ASSEMBLING PNEUMATIC BRAKE
PCT/EP2015/062027 WO2016000880A1 (en) 2014-06-30 2015-05-29 Method and apparatus for assembling a tyre blank

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EP3160724A1 EP3160724A1 (en) 2017-05-03
EP3160724B1 true EP3160724B1 (en) 2019-01-09

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EP (1) EP3160724B1 (en)
CN (1) CN106660286B (en)
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FR3022833B1 (en) 2014-06-30 2017-03-10 Michelin & Cie DEVICE AND METHOD FOR PREPARING A REINFORCING STRIP FOR THE MANUFACTURE OF TIRES
JP6959895B2 (en) * 2018-06-19 2021-11-05 株式会社ブリヂストン Manufacturing method for pneumatic tires and resin-coated belts
FR3088575B3 (en) 2018-11-15 2020-11-20 Michelin & Cie PROCESS AND INSTALLATION FOR SUPPLYING ELASTOMERIC PRODUCTS
FR3088631B3 (en) 2018-11-15 2020-11-20 Michelin & Cie PROCESS AND INSTALLATION FOR TRANSFER OF DISHES

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US2777478A (en) * 1955-01-10 1957-01-15 Odin Corp Wire bending apparatus
DE2058026B2 (en) * 1970-11-25 1975-10-30 Keller, Julius Georg Stefan, Dipl.- Ing., 8000 Muenchen Device for bending the string of struts of lattice girders
JPH0790611B2 (en) * 1987-09-18 1995-10-04 株式会社ブリヂストン Method for manufacturing tire member
JPH0637093B2 (en) * 1989-06-26 1994-05-18 住友ゴム工業株式会社 Tire member manufacturing method and manufacturing apparatus thereof
IT1241332B (en) * 1990-12-04 1994-01-10 Firestone Int Dev Spa METHOD FOR THE REALIZATION OF A REINFORCED COMPONENT OF A VEHICLE TIRE CASE
JP3576321B2 (en) * 1996-07-09 2004-10-13 東京製綱株式会社 Equipment for corrugating steel wires for reinforcing rubber products
DE19901958C2 (en) * 1999-01-20 2001-06-13 Continental Ag Device and method for producing a belt bandage of a pneumatic vehicle tire
JP2006334643A (en) * 2005-06-02 2006-12-14 Yokohama Rubber Co Ltd:The Method for forming wavy wire, and device therefor
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EP3160724A1 (en) 2017-05-03
WO2016000880A1 (en) 2016-01-07
FR3022832B1 (en) 2017-03-10
US20170157873A1 (en) 2017-06-08
CN106660286A (en) 2017-05-10
FR3022832A1 (en) 2016-01-01
CN106660286B (en) 2018-12-11

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